Natural numbers - practice problems - page 8 of 92
Number of problems found: 1834
- Children
Of the estimated 2 billion children living in the developing world, approximately 400 million do not have access to safe drinking water. Approximately what percentage of children in developing countries do not have safe water to drink? - The population 3
The population of the town is 126800. It increases by 15% in the first year and decreases by 20% in the second year. What is the population of the town at the end of 2nd year? - Tricky result
Classic adding with percentages: Evaluate 28% of 450 + 45% of 280 - Population growth 2
The present population of the town is 200,000. Its population increases by 10% in the first year and 15% in the second year. Find the population of the town at the end of the two years. - Planetary system
Robert has built a mechanical model solar system with three balls representing planets at the end of rods. Each rod is attached to the center, representing the Sun. The planets are lined up when he turns on the motor. The innermost planet makes a revoluti - Students 48
If 80% of the students of a school are boys and 225 are girls, find the number of all students. - Distributive property 2
Show with a drawing that 5 × (6 + 2) = 5 × 6 + 5 × 2. What is the name of this property? - A fruit 4
A fruit seller had some apples. He sells 40% apples and still has 420 apples. How many apples originally he had? - An ice cream
An ice cream machine has 3 flavors - vanilla, chocolate, and strawberry. The ice cream can be served in 2 ways - in a cone or in a cup. Along with the ice cream, there are 5 options for toppings - hot fudge, caramel, nuts, cherries, and sprinkles. What is - A restaurant’s A restaurant’s menu has 3 appetizers, 3 mains and 2 desserts. In how many way can a 3-course meal be ordered?
- The marathon
Twelve athletes are joining the Topolcany Marathon Event. How many ways can the first, second, and third placers be chosen? - A band A band played an encore at 2 of its last 4 shows. Considering this data, how many of the band's next 14 shows would you expect to have an encore?
- A fair 2
A fair die is thrown two times. What is the probability that the sum of the score is almost 8? - Divisors 7
If 540=2²×3³×5, what is the number of all factors of 540? - Three numbers
In three numbers, the first number is double the second number, and the second number is double the third. The average of the numbers is 21. Find the least number. - Consecutive odd numbers
Find three consecutive odd numbers whose sum is 93. - Locker combination
Todd forgot the first two numbers of his locker combination. The numbers can be any number 1 through 6. What is the probability that he will guess the first number correctly and the second number incorrectly? - 52 cards
A hand of five cards is dealt from a pack of 52 playing cards. How many different hands can be dealt that contain at least three aces? - Perfect square or cube
Would you classify 324 as a perfect square, perfect cube, both, or neither? ... - Number comparison
How many times is the number 5 times 105 greater than 125 times 103?
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